I was planning to do Langtang and Gosainkund trek for 14 days in Oct. However, I felt sick after arrived to a village at my lunch time which is 3200m. I just stayed in the village to accommodate the altitude before going up to Langtang Village. That is only my second day of trekking. I vomit, then started diarrhea for a week until I go back KTM. Finally, I just didn't go to Gosainkund. Is it a high altitude sickness? If so, how come I still have stomach problem when I going down from Kanyjin Gompa back to Sybrui Bensi? That is not my first time going to high mountain, I just don't believe I got the sickness at 3000m+.